How'd you get the notice that this was submitted so quickly?

wofo 6 hours ago | parent | next [-]

I got a notification through F5 bot (https://f5bot.com/)

	▲	obsidianbases1 4 hours ago \| parent [-]
		Good to know, thanks!

bombcar 6 hours ago | parent | prev [-]

If you watch your refers you'll see HN pretty easily. Could be even setup as a notification.